Apparent Poisson’s Ratio for Fe-Ga Alloy Single Crystal due to Magnetostriction

Fujita, M.; Ikeuchi, Takehito; Koyama, Akihiro; Imafuku, Muneyuki; Fujieda, Shun; Suzuki, Shigeru

doi:10.4028/www.scientific.net/msf.941.879

Cited by 2 publications

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References 3 publications

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“…If the as-grown crystal is rolled even by a small reduction, the fractions are modified to distribute long-range stresses. 15,16) The magnetostriction parallel to the magnetic field direction in sample C was higher than that in sample B up to a magnetic field of less than ca. at 100 kA/m, while the magnetostriction in sample C was lower at a higher magnetic field.…”

Section: Magnetic Propertiesmentioning

confidence: 88%

“…In particular, the magnetostriction of FeGa alloys is influenced by elastic strain fields because it is correlated with the elastic strain and elastic modulus of the alloys, which exhibit orientation dependence. 16) The elastic modulus, elastic strain field induced by plastic deformation, and magnetostriction of alloys exhibit crystallographic orientation dependence, and it is known that orientation affects the magnetostriction of Fe Si alloys. For example, the magnetostriction and magnetization of a FeSi single crystal with a (110) plane parallel to the surface have been examined.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Properties and Substructure of Iron–Gallium Alloy Single Crystals Processed from Ingot to Wafers

et al. 2022

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To process ingots of FeGa alloy single crystals into wafers, Fe17% Ga alloy crystals were cut using multi-wire sawing or electric discharging and rolling. Further, their properties of magnetization and magnetostriction were analyzed using electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). It was observed that the magnetization and magnetostriction curves changed with increasing rolling reduction. Although magnetization was negligibly affected by deformation, the shape of the magnetostriction curve of the as-grown crystal could be modified by a slight reduction in rolling or a slight plastic deformation. EBSD results show that rolling introduced dislocations to form heterogeneous dislocation cell walls and decreased the surface roughness of the wafers. The pole figures obtained by XRD indicate that the samples were single crystals; however, the crystal orientation was different from the ideal orientation after rolling. Residual stress measurements using the cos ¡ method revealed that compressive and tensile stresses remained in the polycrystalline surface layers of the samples cut by multiwire sawing and electric discharging, respectively. Moreover, the stresses were affected by the tensile strains or magnetic fields when the residual stresses were relatively small in the sample. Although the magnetization and magnetostriction of a single crystal are affected by rolling, they are not significantly reduced by small rolling reductions.

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Section: Magnetic Propertiesmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Substructure of Iron–Gallium Alloy Single Crystals Processed from Ingot to Wafers

et al. 2022

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“…56) Considering the auxetic behaviors in FeGa alloys, the volume fractions of magnetic domains with different magnetic moments were also estimated by measuring the tri-axial magnetostriction of an Fe18 at%Ga-alloy single crystal. 58) Moreover, the tetragonal magnetostriction and the magnetostrictive contribution to the Poisson's ratio in FeGa-based ternary alloys were investigated to understand the unique magnetoelasticity in magnetostrictive materials. 5961) In the study, a 3D magnetoelastic model was proposed based on the general expressions for magnetostriction-induced and stress-induced anisotropies.…”

Section: Characteristics Of Elasticitymentioning

confidence: 99%

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

et al. 2019

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This paper provides an overview of recent studies on the anisotropy of magnetostriction of functional iron-based alloys with the bodycentered cubic (bcc) structure; these are potential ferromagnetic materials for use in actuators and sensors at ambient temperature. The magnetostrictive properties of these functional iron-based alloys (such as FeGa, FeAl, and FeGe alloys) are known to strongly depend on the crystallographic orientation. In these functional iron-based alloys, non-Joulian magnetostriction, in which volume is not conserved, was observed; generally, the Joulian magnetostriction in a volume is not altered by magnetic fields. As the magnetostrictive properties of these ironbased alloys are correlated to their elastic properties through the magnetoelastic effect, their elastic properties have also been investigated using single crystals of iron-based alloys. In the present paper, we discuss the characteristic features of the anisotropy of magnetostriction and inverse magnetostriction, which occur when magnetic fields and external stresses, respectively, are applied. In order to clarify the microscopic processes underlying the magnetostriction and inverse magnetostriction, the alterations in the magnetic domains by magnetic fields and external stresses were observed. The results revealed that the magnetic domain structure in the functional iron-based alloys is altered in a complex manner when applied with external fields. For example, it was demonstrated that unique motions of different types of Bloch domain walls are observed with the application of magnetic fields or external stresses along specific directions of single crystals of FeGa alloys. The characteristic features of the motion of the domain walls are likely to correspond to the occurrence of magnetostriction and inverse magnetostriction, in which magnetic fluxes are induced during alternative vibration.

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Apparent Poisson’s Ratio for Fe-Ga Alloy Single Crystal due to Magnetostriction

Cited by 2 publications

References 3 publications

Magnetic Properties and Substructure of Iron–Gallium Alloy Single Crystals Processed from Ingot to Wafers

Magnetic Properties and Substructure of Iron–Gallium Alloy Single Crystals Processed from Ingot to Wafers

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

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